JPS60172723A - Linear ball bearing unit - Google Patents

Abstract

PURPOSE:To improve productivity, by a method wherein a square material, in which ball guide grooves are formed, is split into an upper and a lower part to form 2 bearings formed in the same shape, and half retainers, each of which has ball guide grooves formed in a similar manner therein, are respectively mounted therein. CONSTITUTION:A cylinder inner wall 11, extending through in the direction of an axis, is formed in a square material 10 made of a meterial being excellent in toughness and resistance to wear, and guide grooves 12a-12d for no-load ball and guide grooves 13a-13d for load ball are alternately provided in the inner surface of the inner wall 11. Ball track R grooves 23, having curvature approximating the curvature of load balls 22 and no-load balls 22', are formed in the two side walls of the two guide grooves 12a-12d, and 13a-13d. Plural annular recess grooves 41a-41h are formed in the inner wall of a retainer 40 through partitions 42a-42h. The square material 10 and the retainer 40 are respectively divided into an upper and a lower part to half bearings 10<1> and 10<2> and half retainers 41<1> and 42<2>.

Description

[Detailed Description of the Invention] From the present invention. Light is ball guide #l to increase floating load.
T-divide the formed square piece into upper and lower halves to form a half-split bearing 1, and divide the square piece with a ball guide groove into the half-bearing into two pieces, and install the square piece through the middle-split retainer metal balls. The linear ball bearing made up of and the linear ball bearing 7
This invention relates to a linear ball bearing unit in which the contact angle of the balls on the side surface is Y20 degrees with respect to the horizontal when the raceway shaft is inserted into the ring.

The bearing block of the +7 near ball bearing that the present inventor developed earlier is a linear ball bearing for heavy loads, so the ball guide #I is formed on a square piece of material, and after fc, it is cut off from the left and right lower side ends at an angle to the inner circumference. A cutout is required to incorporate the raceway shaft.

However, if the load is less than heavy, the thick metal 8 is not required.

Therefore, when using the upper and lower manufacturing method, waste of materials is an unavoidable drawback.

The purpose of the present invention is to solve the above-mentioned drawbacks by dividing a square piece of material with ball guide grooves into upper and lower halves so that two identical bearings can be used.
A half-split cage with a ball guide groove formed on it as well? The purpose is to provide a low-cost stringer ball bearing unit that has high productivity and easy accuracy by incorporating each of them.

Another object of the present invention is that the contact angle of the side balls of the linear ball bearing is formed at 30 degrees with respect to the horizontal trap, as shown in FIG. The contact angle of is formed perpendicularly to the horizontal, so if the load from the top surface acting on load ball a is 2 degrees (because the load balls are arranged in two rows on the left and right), the lateral direction The load received is 0.866 (h), and the load in the uplift direction is 0.5 x 5 x 2 = 5.

Therefore, if the superstructure load is set to 1, the lateral load is 0.
．． 4330, and the load in the lifting direction is 0.5.

However, in addition to using this type of linear ball bearing with a simple load applied from the top surface as described above, when using it vertically with a track base R as shown in Fig. 9, it is necessary to use the first O. Figure (a).

As shown in (b), the bearings B, B... all air cylinders AK sliding on the tracks R, R move forward and backward, and the application point S of the load W such as the drill unit D is the first
Figure O (b) As shown in the IC, the upper surface area is further upwards,
The moving driving aperture may be located at the bottom.

In both cases, a large load is applied in the lifting direction, so in conventional bearings, it is necessary to use a larger size bearing or to place the bearing B in the position where it is lifting.
A total of 21 units were used and it was necessary to take care of the temperature.

Therefore, in order to increase the floating load without changing the thickness of the bearing or using two or more bearings, the inventor created a contact angle of #1'f30 degrees with respect to the horizontal. I found that this is the most preferable thing.

That is, as shown in FIGS. 11(a) and 11(b), the orbital axis 5
R11159~ formed on both sides of the 402-strip convex portion 55
60 and the ball raceway R groove 23 of the half bearing 10 are respectively defined as m, rL8m', and rL'.
By forming the contact angle connecting to d-rule '-0' at y30 degrees with respect to the horizontal, the load from the top surface is 0.8660
(h
2 becomes 0.8660 (h.

The object of this invention is to provide a linear ball bearing formed so that when the load from the top surface is 1, the load in the lifting direction is 0.577 (approximately 60%).

The present invention will be explained in detail below based on the drawings.

IO is a square material with high toughness and wear resistance, and the length of the square material 10 is cut to a required size, and a cylindrical inner wall 11 that penetrates in the fine direction is cut.
form.

Reference numerals 1211 to 12d denote guide grooves for unloaded balls, which are formed in the cylindrical inner wall 11 so as to be spaced apart in the radial direction and have a substantially U-shaped cross section.

1311 to 13d are load ball guide grooves, and the loaded ball guide grooves are the same as the non-load ball guide grooves 126 to 12d.
and the guide for the no-load ball @ 1
21 to 12E are formed alternately. VcL forms a plurality of branch zone top walls 14 to 21, and both sides of these branch zone top walls 14 to 21, that is, ball guide grooves 12g to
Load balls 2 are placed on both side walls of 12d and 13g to 13d.
2. Ball orbit R grooves 23 and 23 having a curvature approximating the curvature of the unloaded ball 2g... are formed.

Reference numerals 24 and 25 denote circumferential grooves for changing the direction of the ball formed at both ends of the square timber 10, and since the non-load ball guide grooves 12t to 12d and the loaded ball guide grooves 13g to 13d are formed with the same radius, they are inclined. When forming the stepped portion, it is formed to have the same dimensions as the guide groove.

26.27 is a cage support part, and the cage support part 26.2
7 is formed between both end faces 28, 29 of the square timber 100 by forming the circumferential groove 24, 25t for direction change.

Reference numerals 30 and 31 designate side roots with tarst seals and snap ring grooves formed close to both end surfaces of the square timber lO.

32.32' is a cut, and this cut 32.32' is divided into two along the axial direction from the outer periphery of the square lumber 10 by a cutting grindstone, and is divided into bearings 10' and 101. 40 is a retainer, The container includes a branch zone top wall 14t formed on the inner circumferential surface of the square timber lO, a non-load ball guide groove 12g sandwiched between the load ball guide $13at adjacent to the groove 121, and an annular enclosure @418 surrounding the load ball guide $13at. lF! An annular enclosure #I41kNIA equal to the annular recess #941g is simultaneously molded between the partition walls 42t-.

The retainer 40 is made by disposing a thin-walled steel tube having a diameter t approximately equal to the diameter of the cylindrical inner wall 11 of the square bar 100 between male and female dies of a press, and subjecting the steel tube to several stages of plastic deformation. Partition walls 42g to 42A'1 are formed on the inner wall of the steel pipe, and a plurality of annular grooves 4l to 41A and protrusions +at- are formed at both ends.

45g-45A is an elongated hole, and the elongated hole is a slit cut into an annular groove corresponding to the load ball guide @iag~13d of the square lumber lO, and the ball diameter is such that the load ball 22 does not fall off. Make the width of the dimension area narrower.

The cage 40 is made by dividing the square timber 10 into two halves along the axial direction at a point corresponding to the cuts 32 and 32', and forming half cages 40' and 4.
Divide into 02.

Next, the assembly of the glued ball bearing unit of the present invention will be explained.

No-load ball guide groove 121 of the half bearing 10'
1 and load ball guide @ 13a Annular concave groove 41Jg of intermediate cage 40m fitted to match 13tL
, 414, 2 of the load ball grooves by filling and fitting a large number of balls 22 between 41p and 41h.
Trapezoidal recesses are formed between the balls in the rows. so':s
Both lower ends of the half-split cage 40' fitted in the half-split bearing 10' are fully supported by cage pressers fixed to the lower surface of the xa half-split bearing link.

Reference numeral 52 denotes a grease injection hole, and its tip opening 53 is formed in the load ball guide #1i3a, 13m of the half bearing 10'.

61 is a mounting hole, 62 is a rubber lip, 63 is a snap ring, and 64 is a side plate for attaching a tarst seal.

The shape of the rubber lip above is such that the tip is bent inward and the orbital axis 5
54, which abuts against the slope of the trapezoidal recess 71 formed on both side walls and completely prevents the generation of a gap, is formed with two convex portions 55, 561- in the axial direction of the orbital shaft 54 on the orbital axis; [1
R grooves 57 to 60t are formed on both sides of the two convex portions 55 and 56.

R grooves 59~sot formed on both sides of the two east convex portions 550
! :If the contact points of the half-split bearing with the ball orbit R11ll are m, n, yr', and a, respectively, then Ru' and Go.

The contact angle at 0' is approximately 30 degrees with respect to the horizontal,
This is preferable because it is strong against uplifting loads.

This is because the floating load (X < S) allows these linear bearings to receive loads in all directions consistent with their intended use.

The half-split bearings 10', 10"t of the present invention are made by using a standard square piece 10t, and are divided into upper and lower or left and right parts, thereby producing the same half-split bearings 10", 10".
I can create t-2 pieces.

And since the opening ends of the half bearings xo' and xff can be made larger, the bearing 100 ball guide groove 13g~
Since the ball orbit R#23 of 13I11 can be ground using a large grindstone Tt-, productivity can be increased and at the same time, a highly accurate ball guide Ws can be formed.

Further, as shown in the figure, for the intermediate cage, steel pipes can be used in place of synthetic resin materials for better lubrication performance.

The plastic retainer 70, which is made by injection molding or the like, has loaded balls 22, 22...no-load balls 22.
', 22'...Insert the bearing 10"
'.

The retainer presser 5 prevents the retainer 70 from shifting in the rotational direction.
0, and axial misalignment is prevented with dust seal 11
JIfj130t is prevented by a snap ring 63 (see Fig. 4 II), and upward displacement is prevented by the inner diameter of the bearing l, relief groove 12m, and two load balls #1
311.13- is prevented by contacting the central part.

The plastic retainer 70 does not come into contact with the outer peripheral surface of the raceway shaft 54 since it has a small gap therebetween.

The plastic retainer set in the bearing has excellent lubricity and exhibits the noise-muffling effect unique to plastic.

[Brief explanation of drawings]

1- is a sectional view showing the state before the ball guide #l is formed on the bearing of the linear ball bearing unit of the present invention and divided into upper and lower parts, and Fig. 2 is a sectional view before it is fitted into the linear ball bearing unit of the present invention. FIG. 3 is an assembled cross-sectional front view of the linear ball bearing unit of the present invention, FIG. 48 is a vertical cross-sectional side view of FIG. 3,
FIG. 5 is a cross-sectional view of the raceway shaft, FIG. 6 is a cross-sectional view showing another embodiment of the present invention, FIG. 7 is a cross-sectional view showing the finished state of the ball raceway R groove of the half bearing, and FIG. Figure 8 is an explanatory diagram showing the operating state of the load ball in a conventionally known track base, and Figure 9 is an IJ near ball bearing unit.
1 is an explanatory diagram showing the operating state of the load ball between the ball orbit R111 of the half-split bearing of the general description and the R111 formed on both sides of the convex portion of the orbital axis when used in the vertical direction; FIG. lO: Bearing (standard square material) 20: Ball 10", 10": 7 to half I) Ny24.
2 Circumferential groove for bidirectional change 40: Cage 54: Raceway axis 4x', 4t: Half cage 55', 56: Convex portions 57 to 6 Wan 11th District (A) (B)

Claims (1)

[Claims] a half-split bearing (ld') having a semicircular inner periphery;
Load ball guide groove (13”) of the half bearing (10”)
(134), a continuous track groove is formed in the groove that matches the endless track groove and the non-load ball guide groove, so that the loaded ball in the groove is connected to the loaded ball guide groove (13). (134) and the required locations corresponding to the long holes (4
5a), (45b), (45y), (45) A half retainer (40') with a branched bone wall formed between the left and right concave grooves guiding the no-load bow/I-, and the half retainer (40'). A split cage (40") is inserted into the bearing # (10"), and a halved infinite sliding ball bearing is filled with a large number of balls (20)', and a load ball of the halved ball bearing. A linear ball bearing unit configured with a raceway shaft (54) formed in the ``t'' axis direction to fit between the convex portions (55) and (56) 't'' axis direction.